T6 4motion haldex wiring loom

[t6_tom]

View attachment 145458

Inspired by this thread I turned it on today. I took her for a short spin on an icy road and it seems to give little bit more kick from the rear when accelerating and little bit less less push (understeer) on bends. Not night and day by any means but then again I don’t drive van like a sports car.

Also I kept watching OBD11 live data -> Haldex clutch status. While up to speed it kept at <1% and really only engaged when accelerating. However I haven’t ever looked at that status without the the adaptation so have nothing to compare against. Anyway… quick results: seems like that adaptation is not really a permanent AWD, just little bit more eager to use rear drive. Needs longer term testing though.

Let’s see but maybe I’ll keep it on through winter, I’m not driving much currently though

You may yet inspire me!

Haldex is a pretty clever system. What I would love to know is how it reacts when steering is detected with power with the updated values Vs standard.

On an Audi forum they suggested a 20% fuel economy drop. Which sounds like a lot.

 

[n10n]

On an Audi forum they suggested a 20% fuel economy drop. Which sounds like a lot.

I did read some of those threads and yeah sounds a lot, if that proves to be the case I might drop the idea.

But I got the impression they were mostly interested in from the line performance or behaviour on track - I suppose if you push it AWD could be on all the time and 20% increase sounds realistic. I’m more interested in normal day-to-day driving in winter conditions

 

[DaveD]

I'm no expert, I drive through wet sloppy mud several times a week on fields, but when I experience wheelspin, which is several times a week, all four wheels are spinning, which in my mind means they all have drive. I have decent tyres and I've never needed a tow, so that's good enough for me.

 

[n10n]

Haldex is a pretty clever system. What I would love to know is how it reacts when steering is detected with power with the updated values Vs standard.

Yeah, me too. Data is king - drawing conclusions would require recording things like throttle, speed, steering angle, gear and haldex status over several somewhat repeatable test runs with and without the update.

Too bad obd11 can’t log the data so I can only do some eyeballing currently. Based on my yesterdays short run I suspect the effect is subtle enough to not really show just by glancing every now & then. Also there’s no snow tracks nearby and I’m not about to push for awd action in public roads while watching the cell

 

[t6_tom]

Yeah, me too. Data is king - drawing conclusions would require recording things like throttle, speed, steering angle, gear and haldex status over several somewhat repeatable test runs with and without the update.

Too bad obd11 can’t log the data so I can only do some eyeballing currently. Based on my yesterdays short run I suspect the effect is subtle enough to not really show just by glancing every now & then. Also there’s no snow tracks nearby and I’m not about to push for awd action in public roads while watching the cell

Agree it's a great shame it's hard to log data. I think I will give it a go just to see how it feels. If I get a chance to find a nice big empty slippery roundabout I will try switching it between the modes to see what it feels like.

Will also be interesting to see if it has any effect on fuel consumption.

Always have the dash cams g force monitor. LOL

 

[n10n]

I did read some of those threads and yeah sounds a lot, if that proves to be the case I might drop the idea.

But I got the impression they were mostly interested in from the line performance or behaviour on track - I suppose if you push it AWD could be on all the time and 20% increase sounds realistic. I’m more interested in normal day-to-day driving in winter conditions

Having kept this setting on through the winter I can definitely say there’s no 20% increase in consumption in normal driving. I haven’t attempted to assess the consumption in any analytical manner nor haven’t I driven all that much. Still, I haven’t noticed any increase that could be clearly attributed to this setting, winter consumption is bit higher anyway.

And have to say this setting with ”ESC off” mod was fun, had some nice controlled rear skid moments going up steep icy/snowy/slushy hills

Traction Control - ESC/ASR & HDA switch retrofit